New York Jets cornerback Antonio Cromartie has been flagged for holding — hiding his eldest child from the boy’s distraught mother, she charges.

Cromartie, who has famously fathered 10 kids with eight women in six states, has custody of son Alonzo, 8, but “willfully violates” a court order that gives the boy’s mother visitation, a lawyer alleges.

Rosemita Pierre, of Cromartie’s hometown Tallahassee, Fla., says Cromartie has blocked her from speaking with the boy since last September, and that she hasn’t seen her son for 19 months and is desperately searching for him.

“Just waking every day and not knowing where your child is, it’s hard,” she told The Post, crying. “What gives him the right to take our son and push me out of his life?”

Cromartie won a custody battle in Florida, but the judge ordered that Pierre could speak to her son by phone at least twice a week, and have visits in the summer, Thanksgiving and spring break from school.

When Cromartie and his wife Terricka moved out of a Randolph, N.J. home last year, he did not give Pierre a new address and had ignored her repeated calls, she said.

Both Cromartie and his wife hung up on a Post reporter last week.

Manhattan lawyer Sherri Donovan, who is representing Pierre pro bono, said Cromartie’s former lawyer claims he lost contact with the footballer. Donovan wants to file a motion in court against Cromartie, but does not know where to serve him.

“A child needs contact with both parents. Cromartie is harming his son by keeping him away from his mother,” Donovan said.

Cromartie’s rep, Fadde Mikhail, did not respond to questions. A spokesman for the Jets declined to comment.